CVE-2002-1967: Buffer overflow in XiRCON 1.0 Beta 4 allows remote attackers to cause a denial of service (disconnect) via a l

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MEDIUM 5.0DOWNGRADE

CVE-2002-1967 is a medium-severity flaw (CVSS 5.0) affecting xircon. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in XiRCON 1.0 Beta 4 allows remote attackers to cause a denial of service (disconnect) via a long (1) ctcp, (2) primsg, (3) msg, or (4) notice command.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.9% (top 21%)
CISA exploited list	No
Published	2002-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: mark hanson

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2002-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:00 UTCUpdated Record last modified

mark hanson xircon DOWNGRADE

Affected: 1.0_beta_4

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0_beta_4

1. Check installed version

apt-cache policy xircon || rpm -q xircon || xircon --version

2. No fixed release: DOWNGRADE to a release before 1.0_beta_4 (Debian / Ubuntu)

apt-cache madison xircon sudo apt install xircon=<VERSION_BEFORE_1.0_beta_4> sudo apt-mark hold xircon

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list xircon sudo dnf downgrade xircon-<VERSION_BEFORE_1.0_beta_4> sudo dnf versionlock add xircon

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2002-1967?

xircon: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2002-1967 being exploited?

CVE-2002-1967 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2002-1967 affect?

CVE-2002-1967 affects xircon. Severity is medium (CVSS 5.0). Buffer overflow in XiRCON 1.0 Beta 4 allows remote attackers to cause a denial of service (disconnect) via a long (1) ctcp, (2) primsg, (3) msg, or (4) notice command.

How urgent is CVE-2002-1967?

Priority 42/100. Public exploit reference

References

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